<template>
   <!-- 商品分类导航 -->
    <div class="type-nav">
        <div class="container">
          <!-- 鼠标移入进行展示 鼠标移除展示消失 -->
          <div @mouseenter="enterShow" @mouseleave="leaveShow">
             <h2 class="all">全部商品分类</h2>
             <!-- 添加过度动画效果 -->
             <transition name="sort">
               <div class="sort" v-show="show">
                <!-- 通过事件委派来进行跳转 -->
                <div class="all-sort-list2" @click="goSearch">
                    <div class="item" v-for="c1 in categoryList" :key="c1.categoryId">
                        <h3>
                            <a :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{c1.categoryName}}</a>
                        </h3>
                        <div class="item-list clearfix">
                            <div class="subitem" v-for="c2 in c1.categoryChild" :key="c2.categoryId">
                                <dl class="fore">
                                    <dt>
                                        <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{c2.categoryName}}</a>
                                    </dt>
                                    <dd>
                                        <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                                            <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{c3.categoryName}}</a></a>
                                        </em>
                                    </dd>
                                </dl>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
             </transition>
          </div>
            <nav class="nav">
                <a href="###">服装城</a>
                <a href="###">美妆馆</a>
                <a href="###">尚品汇超市</a>
                <a href="###">全球购</a>
                <a href="###">闪购</a>
                <a href="###">团购</a>
                <a href="###">有趣</a>
                <a href="###">秒杀</a>
            </nav>
            
        </div>
    </div>
</template>

<script>
import { mapState } from "vuex";
export default {
  name: "TypeNav",
  data() {
    return {
      show: true,
    };
  },
  methods: {
    goSearch(event) {
      let element = event.target;
      //对对象进行解构赋值   element.dataset:获取元素身上的自定义属性
      let { categoryname, category1id, category2id, category3id } =
        element.dataset;
      //含有自定义属性说明是a标签
      if (categoryname) {
        //整理路由跳转的参数
        let location = { name: "search" };
        let query = { categoryName: categoryname };
        if (category1id) {
          query.category1Id = category1id;
        } else if (category2id) {
          query.category2Id = category2id;
        } else {
          query.category3Id = category3id;
        }
        location.params = this.$route.params;
        location.query = query;
        //路由跳转
        this.$router.push(location);
      }
    },
    enterShow(){
      this.show = true;
    },
    leaveShow(){
      if (this.$route.path!='/home'){
         this.show = false;
      }
    }
  },
  mounted() {
   
    if (this.$route.path != "/home") {
      this.show = false;
    }
  },
  computed: {
    //    state的简写方式
    ...mapState({
      categoryList: (state) => state.home.categoryList,
    }),
  },
};
</script>

<style scoped lang='less'>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
        // 当鼠标移到上边时，背景颜色变为天蓝色
        .item :hover {
          background: skyblue;
        }
      }
    }
    //过渡动画的样式
    //过渡动画开始状态（进入）
    .sort-enter {
      height: 0px;
    }
    // 过渡动画结束状态（进入）
    .sort-enter-to {
      height: 461px;
    }
    // 定义动画时间、速率
    .sort-enter-active {
      transition: all 0.5s linear;
    }
  }
}
</style>